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From: "hubicka at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/99411] s311, s312, s31111, s31111, s3110,
 vsumr benchmark of TSVC is vectorized by clang better than by gcc
Date: Wed, 11 Jan 2023 22:36:50 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D99411

--- Comment #8 from Jan Hubicka <hubicka at gcc dot gnu.org> ---
Compared to aocc we also do worse on zen4:
jh@alberti:~/tsvc/bin> ~/trunk-install/bin/gcc -Ofast -march=3Dnative s311.=
c=20=20=20=20=20=20
jh@alberti:~/tsvc/bin> time ./a.out

real    0m3.207s
user    0m3.206s
sys     0m0.000s
jh@alberti:~/tsvc/bin> ~/aocc-compiler-4.0.0/bin/clang -Ofast -march=3Dnati=
ve
s311.c=20
jh@alberti:~/tsvc/bin> time ./a.out

real    0m1.221s
user    0m1.221s
sys     0m0.000s

aocc code seems similar to clangs from two years ago except for additional =
use
of avx512.

main:                                   # @main
        .cfi_startproc
# %bb.0:                                # %entry
        xorl    %eax, %eax
        .p2align        4, 0x90
.LBB0_1:                                # %vector.ph
                                        # =3D>This Loop Header: Depth=3D1
                                        #     Child Loop BB0_2 Depth 2
        vxorps  %xmm0, %xmm0, %xmm0
        movq    $-128000, %rcx                  # imm =3D 0xFFFE0C00
        vxorps  %xmm1, %xmm1, %xmm1
        vxorps  %xmm2, %xmm2, %xmm2
        vxorps  %xmm3, %xmm3, %xmm3
        .p2align        4, 0x90
.LBB0_2:                                # %vector.body
                                        #   Parent Loop BB0_1 Depth=3D1
                                        # =3D>  This Inner Loop Header: Dep=
th=3D2
        vaddps  a+128000(%rcx), %zmm0, %zmm0
        vaddps  a+128064(%rcx), %zmm1, %zmm1
        vaddps  a+128128(%rcx), %zmm2, %zmm2
        vaddps  a+128192(%rcx), %zmm3, %zmm3
        addq    $256, %rcx                      # imm =3D 0x100
        jne     .LBB0_2
# %bb.3:                                # %middle.block
                                        #   in Loop: Header=3DBB0_1 Depth=
=3D1
        incl    %eax
        cmpl    $1000000, %eax                  # imm =3D 0xF4240
        jne     .LBB0_1
# %bb.4:                                # %for.cond.cleanup
        vaddps  %zmm0, %zmm1, %zmm0
        xorl    %eax, %eax
        vaddps  %zmm0, %zmm2, %zmm0
        vaddps  %zmm0, %zmm3, %zmm0
        vextractf64x4   $1, %zmm0, %ymm1
        vaddps  %zmm1, %zmm0, %zmm0
        vextractf128    $1, %ymm0, %xmm1
        vaddps  %xmm1, %xmm0, %xmm0
        vpermilpd       $1, %xmm0, %xmm1        # xmm1 =3D xmm0[1,0]
        vaddps  %xmm1, %xmm0, %xmm0
        vmovshdup       %xmm0, %xmm1            # xmm1 =3D xmm0[1,1,3,3]
        vaddss  %xmm1, %xmm0, %xmm0
        vucomiss        .LCPI0_0(%rip), %xmm0
        seta    %al
        vzeroupper
        retq=